I ran a quick "/engine failsafe" in the bestlinks, only to find, much to my chagrin, nothing was found! (oh, the horror!)

So, I ran a quick "advanced" selecting E39-only title-only search for "engine failsafe", which found 23 threads of interest.

To zero in on the 'best' thread, I sorted the results by number of views. The assumption is that a thread with only, say, 10 to 100 views might not have had enough 'eyes' on it to fully flesh out the problem or to weed out the inevitable bad advice. However, a thread with, say, ten thousand views, should have most of the bad advice weeded out and most of the good advice suggested.

As always, YMMV.

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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need